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<pre><code><a href="#1" id="1" class="l">  1: </a><span class="xlang">&lt;?php</span>
<a href="#2" id="2" class="l">  2: </a>
<a href="#3" id="3" class="l">  3: </a><span class="php-comment">/* 事件监听机制，用于扩展支持 */</span>
<a href="#4" id="4" class="l">  4: </a>
<a href="#5" id="5" class="l">  5: </a><span class="php-comment">/**
</span><a href="#6" id="6" class="l">  6: </a><span class="php-comment"> * 监听器/观察者
</span><a href="#7" id="7" class="l">  7: </a><span class="php-comment"> * 由前置增强、中置增强、后置增强构成。
</span><a href="#8" id="8" class="l">  8: </a><span class="php-comment"> * 其中，前置增强、后置增强的执行结果分别保存在DIBase子类的$_before、$_after属性，类型为array
</span><a href="#9" id="9" class="l">  9: </a><span class="php-comment"> *      中置增强不需要外置的存储器（如$_before、$_after）。
</span><a href="#10" id="10" class="l"> 10: </a><span class="php-comment"> * 要使用中置增强，只需要在为DIBase的非抽象子类的方法参数传入callback即可，
</span><a href="#11" id="11" class="l"> 11: </a><span class="php-comment"> *      在具体的子类方法中，可以手动获取到这些callback的返回值，
</span><a href="#12" id="12" class="l"> 12: </a><span class="php-comment"> *      这也侧面说明，中置增强的返回值可以直接在DIBase非抽象子类方法体中获取。
</span><a href="#13" id="13" class="l"> 13: </a><span class="php-comment"> * DIEventListener子接口命名规范：严格依照 DIEvent_XxxxYyyZzzListener
</span><a href="#14" id="14" class="l"> 14: </a><span class="php-comment"> */</span>
<a href="#15" id="15" class="l"> 15: </a><span class="php-keyword1">interface</span> DIEventListener {}
<a href="#16" id="16" class="l"> 16: </a>
<a href="#17" id="17" class="l"> 17: </a><span class="php-comment">//实例化</span>
<a href="#18" id="18" class="l"> 18: </a><span class="php-keyword1">interface</span> DIEvent_ObjCreateListener <span class="php-keyword1">extends</span> DIEventListener {
<a href="#19" id="19" class="l"> 19: </a>    <span class="php-keyword1">function</span> beforeObjCreate();
<a href="#20" id="20" class="l"> 20: </a>    <span class="php-keyword1">function</span> onObjCreate();
<a href="#21" id="21" class="l"> 21: </a>    <span class="php-keyword1">function</span> afterObjCreate();
<a href="#22" id="22" class="l"> 22: </a>}
<a href="#23" id="23" class="l"> 23: </a>
<a href="#24" id="24" class="l"> 24: </a><span class="php-comment">//调用对象</span>
<a href="#25" id="25" class="l"> 25: </a><span class="php-keyword1">interface</span> DIEvent_ObjCallListener <span class="php-keyword1">extends</span> DIEventListener {
<a href="#26" id="26" class="l"> 26: </a>    <span class="php-keyword1">function</span> beforeObjCall();
<a href="#27" id="27" class="l"> 27: </a>    <span class="php-keyword1">function</span> onObjCall();
<a href="#28" id="28" class="l"> 28: </a>    <span class="php-keyword1">function</span> afterObjCall();
<a href="#29" id="29" class="l"> 29: </a>}
<a href="#30" id="30" class="l"> 30: </a>
<a href="#31" id="31" class="l"> 31: </a><span class="php-comment">//调用类</span>
<a href="#32" id="32" class="l"> 32: </a><span class="php-keyword1">interface</span> DIEvent_ClassCallListener <span class="php-keyword1">extends</span> DIEventListener {
<a href="#33" id="33" class="l"> 33: </a>    <span class="php-keyword1">function</span> beforeClassCall();
<a href="#34" id="34" class="l"> 34: </a>    <span class="php-keyword1">function</span> onClassCall();
<a href="#35" id="35" class="l"> 35: </a>    <span class="php-keyword1">function</span> afterClassCall();
<a href="#36" id="36" class="l"> 36: </a>}
<a href="#37" id="37" class="l"> 37: </a>
<a href="#38" id="38" class="l"> 38: </a><span class="php-comment">//读取类的实例变量</span>
<a href="#39" id="39" class="l"> 39: </a><span class="php-keyword1">interface</span> DIEvent_GetVariableListener <span class="php-keyword1">extends</span> DIEventListener {
<a href="#40" id="40" class="l"> 40: </a>    <span class="php-keyword1">function</span> beforeGetVariable();
<a href="#41" id="41" class="l"> 41: </a>    <span class="php-keyword1">function</span> onGetVariable();
<a href="#42" id="42" class="l"> 42: </a>    <span class="php-keyword1">function</span> afterGetVariable();
<a href="#43" id="43" class="l"> 43: </a>}
<a href="#44" id="44" class="l"> 44: </a>
<a href="#45" id="45" class="l"> 45: </a><span class="php-comment">//读取类的静态变量</span>
<a href="#46" id="46" class="l"> 46: </a><span class="php-keyword1">interface</span> DIEvent_GetStaticVariableListener <span class="php-keyword1">extends</span> DIEventListener {
<a href="#47" id="47" class="l"> 47: </a>    <span class="php-keyword1">function</span> beforeGetStaticVariable();
<a href="#48" id="48" class="l"> 48: </a>    <span class="php-keyword1">function</span> onGetStaticVariable();
<a href="#49" id="49" class="l"> 49: </a>    <span class="php-keyword1">function</span> afterGetStaticVariable();
<a href="#50" id="50" class="l"> 50: </a>}
<a href="#51" id="51" class="l"> 51: </a>
<a href="#52" id="52" class="l"> 52: </a><span class="php-comment">//写入类的实例变量</span>
<a href="#53" id="53" class="l"> 53: </a><span class="php-keyword1">interface</span> DIEvent_SetVariableListener <span class="php-keyword1">extends</span> DIEventListener {
<a href="#54" id="54" class="l"> 54: </a>    <span class="php-keyword1">function</span> beforeSetVariable();
<a href="#55" id="55" class="l"> 55: </a>    <span class="php-keyword1">function</span> onSetVariable();
<a href="#56" id="56" class="l"> 56: </a>    <span class="php-keyword1">function</span> afterSetVariable();
<a href="#57" id="57" class="l"> 57: </a>}
<a href="#58" id="58" class="l"> 58: </a>
<a href="#59" id="59" class="l"> 59: </a><span class="php-comment">//写入类的静态变量</span>
<a href="#60" id="60" class="l"> 60: </a><span class="php-keyword1">interface</span> DIEvent_SetStaticVariableListener <span class="php-keyword1">extends</span> DIEventListener {
<a href="#61" id="61" class="l"> 61: </a>    <span class="php-keyword1">function</span> beforeSetStaticVariable();
<a href="#62" id="62" class="l"> 62: </a>    <span class="php-keyword1">function</span> onSetStaticVariable();
<a href="#63" id="63" class="l"> 63: </a>    <span class="php-keyword1">function</span> afterSetStaticVariable();
<a href="#64" id="64" class="l"> 64: </a>}
<a href="#65" id="65" class="l"> 65: </a>
<a href="#66" id="66" class="l"> 66: </a><span class="php-comment">//向类的实例追加成员变量</span>
<a href="#67" id="67" class="l"> 67: </a><span class="php-keyword1">interface</span> DIEvent_AppendVariableListener <span class="php-keyword1">extends</span> DIEventListener {
<a href="#68" id="68" class="l"> 68: </a>    <span class="php-keyword1">function</span> beforeAppendVariable();
<a href="#69" id="69" class="l"> 69: </a>    <span class="php-keyword1">function</span> onAppendVariable();
<a href="#70" id="70" class="l"> 70: </a>    <span class="php-keyword1">function</span> afterAppendVariable();
<a href="#71" id="71" class="l"> 71: </a>}
<a href="#72" id="72" class="l"> 72: </a>
<a href="#73" id="73" class="l"> 73: </a><span class="php-comment">//调用类的实例方法：[__call()提供支持]</span>
<a href="#74" id="74" class="l"> 74: </a><span class="php-keyword1">interface</span> DIEvent_CallFuncListener <span class="php-keyword1">extends</span> DIEventListener {
<a href="#75" id="75" class="l"> 75: </a>    <span class="php-keyword1">function</span> beforeCallFunc();
<a href="#76" id="76" class="l"> 76: </a>    <span class="php-keyword1">function</span> onCallFunc();
<a href="#77" id="77" class="l"> 77: </a>    <span class="php-keyword1">function</span> afterCallFunc();
<a href="#78" id="78" class="l"> 78: </a>}
<a href="#79" id="79" class="l"> 79: </a>
<a href="#80" id="80" class="l"> 80: </a><span class="php-comment">//调用类的静态方法</span>
<a href="#81" id="81" class="l"> 81: </a><span class="php-keyword1">interface</span> DIEvent_CallStaticFuncListener <span class="php-keyword1">extends</span> DIEventListener {
<a href="#82" id="82" class="l"> 82: </a>    <span class="php-keyword1">function</span> beforeCallStaticFunc();
<a href="#83" id="83" class="l"> 83: </a>    <span class="php-keyword1">function</span> onCallStaticFunc();
<a href="#84" id="84" class="l"> 84: </a>    <span class="php-keyword1">function</span> afterCallStaticFunc();
<a href="#85" id="85" class="l"> 85: </a>}
<a href="#86" id="86" class="l"> 86: </a>
<a href="#87" id="87" class="l"> 87: </a><span class="php-comment">//向类的实例追加方法</span>
<a href="#88" id="88" class="l"> 88: </a><span class="php-keyword1">interface</span> DIEvent_AppendFuncListener <span class="php-keyword1">extends</span> DIEventListener {
<a href="#89" id="89" class="l"> 89: </a>    <span class="php-keyword1">function</span> beforeAppendFunc();
<a href="#90" id="90" class="l"> 90: </a>    <span class="php-keyword1">function</span> onAppendFunc();
<a href="#91" id="91" class="l"> 91: </a>    <span class="php-keyword1">function</span> afterAppendFunc();
<a href="#92" id="92" class="l"> 92: </a>}
<a href="#93" id="93" class="l"> 93: </a>
<a href="#94" id="94" class="l"> 94: </a><span class="php-comment">//销毁</span>
<a href="#95" id="95" class="l"> 95: </a><span class="php-keyword1">interface</span> DIEvent_DestroyListener <span class="php-keyword1">extends</span> DIEventListener {
<a href="#96" id="96" class="l"> 96: </a>    <span class="php-keyword1">function</span> beforeDestroy();
<a href="#97" id="97" class="l"> 97: </a>    <span class="php-keyword1">function</span> onDestroy();
<a href="#98" id="98" class="l"> 98: </a>    <span class="php-keyword1">function</span> afterDestroy();
<a href="#99" id="99" class="l"> 99: </a>}
<a href="#100" id="100" class="l">100: </a>
<a href="#101" id="101" class="l">101: </a>
<a href="#102" id="102" class="l">102: </a><span class="php-comment">//事件/主题。为子类提供使用观察者模式的支持。</span>
<a href="#103" id="103" class="l">103: </a><span class="php-keyword1">abstract</span> <span class="php-keyword1">class</span> DIEvent {
<a href="#104" id="104" class="l">104: </a>    
<a href="#105" id="105" class="l">105: </a>    <span class="php-keyword1">protected</span> <span class="php-var">$eventListeners</span> = <span class="php-keyword1">array</span>();    <span class="php-comment">//DIEventListener</span>
<a href="#106" id="106" class="l">106: </a>    <span class="php-keyword1">protected</span> <span class="php-var">$eventType</span>;   <span class="php-comment">//当前事件类型，由此决定notify()方法执行情况</span>
<a href="#107" id="107" class="l">107: </a>    
<a href="#108" id="108" class="l">108: </a>    <span class="php-keyword1">function</span> attachEventListener(DIEventListener <span class="php-var">$ael</span>){
<a href="#109" id="109" class="l">109: </a>        <span class="php-keyword2">array_push</span>(<span class="php-var">$this</span>-&gt;eventListeners, <span class="php-var">$ael</span>);
<a href="#110" id="110" class="l">110: </a>    }
<a href="#111" id="111" class="l">111: </a>    
<a href="#112" id="112" class="l">112: </a>    <span class="php-keyword1">function</span> detachEventListener(DIEventListener <span class="php-var">$ael</span>){
<a href="#113" id="113" class="l">113: </a>        <span class="php-var">$this</span>-&gt;eventListeners = <span class="php-keyword2">array_filter</span>(<span class="php-var">$this</span>-&gt;eventListeners, <span class="php-keyword1">function</span> (<span class="php-var">$var</span>) <span class="php-keyword1">use</span> (<span class="php-var">$ael</span>){
<a href="#114" id="114" class="l">114: </a>            <span class="php-keyword1">return</span> <span class="php-var">$var</span> != <span class="php-var">$ael</span>;
<a href="#115" id="115" class="l">115: </a>        });
<a href="#116" id="116" class="l">116: </a>    }
<a href="#117" id="117" class="l">117: </a>    
<a href="#118" id="118" class="l">118: </a>    <span class="php-comment">//如何做到自动通知？</span>
<a href="#119" id="119" class="l">119: </a>    <span class="php-keyword1">function</span> notify(){
<a href="#120" id="120" class="l">120: </a>        <span class="php-keyword1">foreach</span> (<span class="php-var">$this</span>-&gt;eventListeners <span class="php-keyword1">as</span> <span class="php-var">$el</span>){
<a href="#121" id="121" class="l">121: </a>            <span class="php-keyword1">foreach</span> (<span class="php-keyword2">get_class_methods</span>(<span class="php-var">$el</span>) <span class="php-keyword1">as</span> <span class="php-var">$m</span>){
<a href="#122" id="122" class="l">122: </a>                <span class="php-keyword2">call_user_func_array</span>(<span class="php-keyword1">array</span>(<span class="php-var">$el</span>, <span class="php-var">$m</span>), <span class="php-keyword1">array</span>());
<a href="#123" id="123" class="l">123: </a>            }
<a href="#124" id="124" class="l">124: </a>        }
<a href="#125" id="125" class="l">125: </a>    }
<a href="#126" id="126" class="l">126: </a>    
<a href="#127" id="127" class="l">127: </a>}</code></pre>

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